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src/common/tuklib_open_stdxxx.c
56 строк
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Lasse Collin
Add SPDX license identifier into 0BSD source code files.
14 фев 2024, 19:31
14 фев 2024, 19:31
22af941
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// SPDX-License-Identifier: 0BSD /////////////////////////////////////////////////////////////////////////////// // /// \file tuklib_open_stdxxx.c /// \brief Make sure that file descriptors 0, 1, and 2 are open // // Author: Lasse Collin // /////////////////////////////////////////////////////////////////////////////// #include "tuklib_open_stdxxx.h" #ifndef TUKLIB_DOSLIKE # include <stdlib.h> # include <errno.h> # include <fcntl.h> # include <unistd.h> #endif extern void tuklib_open_stdxxx(int err_status) { #ifdef TUKLIB_DOSLIKE // Do nothing, just silence warnings. (void)err_status; #else for (int i = 0; i <= 2; ++i) { // We use fcntl() to check if the file descriptor is open. if (fcntl(i, F_GETFD) == -1 && errno == EBADF) { // With stdin, we could use /dev/full so that // writing to stdin would fail. However, /dev/full // is Linux specific, and if the program tries to // write to stdin, there's already a problem anyway. const int fd = open("/dev/null", O_NOCTTY | (i == 0 ? O_WRONLY : O_RDONLY)); if (fd != i) { if (fd != -1) (void)close(fd); // Something went wrong. Exit with the // exit status we were given. Don't try // to print an error message, since stderr // may very well be non-existent. This // error should be extremely rare. exit(err_status); } } } #endif return; }